31160231 has 2 divisors, whose sum is σ = 31160232. Its totient is φ = 31160230.

The previous prime is 31160189. The next prime is 31160249. The reversal of 31160231 is 13206113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31160231 is a prime.

It is a super-2 number, since 2×31160231² = 1941919991946722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31160291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15580115 + 15580116.

It is an arithmetic number, because the mean of its divisors is an integer number (15580116).

Almost surely, 2^31160231 is an apocalyptic number.

31160231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31160231 is an equidigital number, since it uses as much as digits as its factorization.

31160231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 31160231 is about 5582.1349858276. The cubic root of 31160231 is about 314.6783682737.

Adding to 31160231 its reverse (13206113), we get a palindrome (44366344).

The spelling of 31160231 in words is "thirty-one million, one hundred sixty thousand, two hundred thirty-one".